Inuyasha: The Secret of the Cursed Mask

Get Past Mansion Level
When in a room having dinner, g to the wall on the right. Now, go to the top wall and press the X button. Then the main character will say something. Afterwards, talk to Inuyasha then you exit and fight. Go up where you will see some demons. Then go all the way down, then go left. Enter a room and click on a ? mark, then exit. Go right back to the way to the demons. Plant the ? there and fight a whole bunch of demons. Go to the place where the group of demons were and go through the passage. Find Miroku, beat the boss and you win.
(Thanks to TrinidadPeps0812@aol.com)